The Sport Relief sketch was written by late creator John Sullivan's sons Jim and Dan.

Speaking to Radio Times, Jim Sullivan said: "It has been emotional, and dad was never far from our thoughts during the whole process.

"And, of course, we were all shocked and saddened at the news of Roger Lloyd Pack's death. We had originally written Trigger into the sketch, and Roger was supportive of the whole thing."

He continued: "We had heard he had been unwell, but had no idea how serious it was. It wasn't until shortly before filming that we heard he was too poorly to perform, such was eagerness to be involved - a true testament to his character."